At a glance
Pioneer Square Hotel Annex is a 48,650-square-foot hotel at 110 ALASKAN WAY S in Seattle, Washington, built in 2021. In its 2025 Seattle benchmarking disclosure it reported an ENERGY STAR score of 100 out of 100 (grade A), a site energy-use intensity of 9.5 kBtu/ft² and 4 tCO₂e of greenhouse-gas emissions. That score is higher than 95% of the 78 scored hotel buildings in Seattle.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 100 (band A) |
| Site EUI | 9.5 kBtu/ft² |
| Source EUI | 23.8 kBtu/ft² |
| GHG emissions | 4 tCO₂e |
| GHG intensity | 0.1 kgCO₂e/ft² |
| Electricity | 66,798 kWh |
| Natural gas | 468 therms |
| Gross floor area | 48,650 sq ft |
| Source record | seattle:50903:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | 100 | ±0 | 9.5 kBtu/ft² | 4 tCO₂e |
| 2024 | 100 | ±0 | 9.6 kBtu/ft² | 4 tCO₂e |
| 2023 | 100 | 10.8 kBtu/ft² | 6 tCO₂e |
Compliance context
Seattle Energy Benchmarking Ordinance (SMC 22.920)
Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 110 ALASKAN WAY S
- City
- Seattle
- State
- Washington
- ZIP
- 98104
- Coordinates
- 47.60135, -122.33521
Within ~1 km
Nearby benchmarked buildings
- Columbia Centerscore 90
Office · 1,952,220 sq ft
- Centurylink Field-Stadiumscore —
Stadium (Open) · 1,913,640 sq ft
- Russell Investments Centerscore 92
Office · 1,592,914 sq ft
Office · 1,527,817 sq ft
Office · 1,413,575 sq ft
- Seattle Municipal Towerscore 86
Office · 1,354,987 sq ft
See also: most efficient in Seattle · biggest emitters
How does Pioneer Square Hotel Annex compare with other hotel buildings in Seattle?
The latest disclosures cover 86 hotel buildings in Seattle, out of 3,871 buildings citywide. Pioneer Square Hotel Annex's ENERGY STAR score of 100 compares with an average of 76 across the 78 that report a score; it scores higher than 95% of them. Its site EUI of 9.5 kBtu/ft² is about 86% below the average of 68.4 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.1 kgCO₂e/ft² is about 94% below the group average of 2.0 kgCO₂e/ft².
At 48,650 sq ft, it is about 71% below the average floor area of 165,912 sq ft for those buildings. It was built in 2021, 51 years later than the group's average year built (1971). Across all 24 jurisdictions BuildingCensus covers, the 3,812 hotel buildings average an ENERGY STAR score of 65 and a site EUI of 77.8 kBtu/ft².
How has Pioneer Square Hotel Annex's energy performance changed over time?
BuildingCensus holds 3 Seattle disclosures for Pioneer Square Hotel Annex, covering report years 2023–2025. Its ENERGY STAR score was 100 in both 2023 and 2025. Site EUI moved from 10.8 kBtu/ft² (2023) to 9.5 kBtu/ft² (2025), a 12% decrease. Reported emissions went from 6 tCO₂e to 4 tCO₂e over the same span (down 39%).
What does an ENERGY STAR score of 100 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: 100 is the top of the scale. BuildingCensus bands the score into report-card grades; 100 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. In Seattle, 69% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. Pioneer Square Hotel Annex's 9.5 kBtu/ft² across 48,650 sq ft works out to about 0.5 billion Btu (135 MWh-equivalent) in 2025. Its source EUI of 23.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 66,798 kWh of electricity and 468 therms of natural gas for the year.
Which law requires Pioneer Square Hotel Annex to report its energy use?
Pioneer Square Hotel Annex reports under the Seattle Energy Benchmarking Ordinance (SMC 22.920), the legal basis of Seattle's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record seattle:50903:2025). Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
More hotel buildings in Seattle
- Virginia Mason- Inn At Virginia Mason· 48,006 sq ft · score 98 (A)
- Best Western Pioneer Square Hotel· 45,500 sq ft · score 87 (A)
- State Hotel· 44,928 sq ft · score 85 (A)
- THE LOYAL INN- DEMOLISHED· 44,416 sq ft · score 99 (A)
- Comfort Inn & Suites - Seattle North· 41,704 sq ft · score 98 (A)
- Oxford Apartments· 40,950 sq ft · score 78 (B)
- Hotel buildings in Seattle· 86 benchmarked
- All Seattle benchmarked buildings· Seattle Energy Benchmarking Ordinance (SMC 22.920)
- Most efficient large buildings in Seattle
- Least efficient large buildings in Seattle
- Biggest emitters in Seattle
Frequently asked questions
What is Pioneer Square Hotel Annex's energy grade?
Pioneer Square Hotel Annex scores 100 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2025 Seattle disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Pioneer Square Hotel Annex use?
Its 2025 site energy-use intensity was 9.5 kBtu/ft² (23.8 kBtu/ft² source) across 48,650 sq ft, including 66,798 kWh of electricity and 468 therms of natural gas.
What are Pioneer Square Hotel Annex's carbon emissions?
Pioneer Square Hotel Annex reported 4 tCO₂e of greenhouse-gas emissions (0.1 kgCO₂e/ft²) for 2025.
Where is Pioneer Square Hotel Annex?
Pioneer Square Hotel Annex is at 110 ALASKAN WAY S, in Seattle, Washington 98104. Its coordinates are 47.60135, -122.33521 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Pioneer Square Hotel Annex and when was it built?
Pioneer Square Hotel Annex has 48,650 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2021 as its year built. It is classed as hotel.
Is Pioneer Square Hotel Annex covered by the Seattle Energy Benchmarking Ordinance (SMC 22.920)?
Yes — it appears in the 2025 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Seattle Energy Benchmarking Ordinance (SMC 22.920).
Working with Seattle building benchmarking records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
About this data
Source: Building Energy Benchmarking (Seattle Energy Benchmarking Ordinance (SMC 22.920)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Pioneer Square Hotel Annex, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/pioneer-square-hotel-annex-0b9a228d (data as of October 2, 2026).